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avcodec/snowdec: Fix ref value check 

Fixes integer overflow and out of array read.
Fixes: signal_sigsegv_24169e6_3445_cov_3778346427_snow_chroma_bug.avi

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 8f4cbf9402)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-02-24 03:12:22 +01:00
parent 2dde6d5d36
commit 4954306228
1 changed files with 1 additions and 1 deletions
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2
libavcodec/snowdec.c
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@ -152,7 +152,7 @@ static int decode_q_branch(SnowContext *s, int level, int x, int y){
int l = left->color[0];
int cb= left->color[1];
int cr= left->color[2];
int ref = 0;
unsigned ref = 0;
int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx));
int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my));